code: def test_preprocessing_normalize(self):
      s = pdml.ModelSeries(
          [1, 2, 3, 4, 5], index=["A", "B", "C", "D", "E"]
      )
      self.assertIsInstance(s, pdml.ModelSeries)
      result = s.preprocessing.normalize()
      expected = pp.normalize(np.atleast_2d(s.values.astype(np.float)))[
          0, :
      ]
  
      self.assertIsInstance(result, pdml.ModelSeries)
      self.assert_numpy_array_almost_equal(result.values, expected)
      tm.assert_index_equal(result.index, s.index)
  
file_path: pandas-ml/pandas_ml/test/test_series.py
imports: import numpy
  import pandas
  import sklearn.preprocessing
  import pandas_ml
  import pandas_ml.util.testing
label_desc: Use image node_id 3 for calling the TestModelSeries obj's underlying member method code with example usage: obj.test_preprocessing_normalize() without return types